Air Masses and Weather Symbols

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Across
  1. 3. a big black dot
  2. 6. 3 horizontal lines
  3. 8. curved blue lines with blue triangles
  4. 9. a large volume of air in the atmosphere
  5. 11. hot, dry and unstable
  6. 12. origins over the North Pole and Arctic Ocean
Down
  1. 1. cold, dry and stable
  2. 2. 2 horizontal lines
  3. 4. curved red lines with red semicircles
  4. 5. starts very cold and dry
  5. 7. warm and moist in its lowest layers
  6. 10. an upside down triangle